from unittest.mock import MagicMock, patch

import pytest

from src.utilities.zeroconf_server import ZeroconfServer


class TestConfigure:
    """Configuring service parameters."""

    def test_configure_sets_attributes(self, zeroconf_server_instance):
        with patch('socket.gethostbyname', return_value='192.168.1.1'):
            ZeroconfServer.configure('_zordon._tcp.local.', 'test-server', 8080)

        assert zeroconf_server_instance.service_type == '_zordon._tcp.local.'
        assert zeroconf_server_instance.server_name == 'test-server'
        assert zeroconf_server_instance.server_port == 8080

    def test_configure_calls_sync_class(self, zeroconf_server_instance):
        with patch('socket.gethostbyname', return_value='192.168.1.1'):
            ZeroconfServer.configure('_zordon._tcp.local.', 'test-server', 8080)

        assert ZeroconfServer.service_type == '_zordon._tcp.local.'
        assert ZeroconfServer.server_port == 8080

    def test_configure_stops_on_gaierror(self, zeroconf_server_instance):
        import socket
        with patch('socket.gethostbyname', side_effect=socket.gaierror):
            with patch.object(zeroconf_server_instance, '_stop') as mock_stop:
                ZeroconfServer.configure('_zordon._tcp.local.', 'test-server', 8080)
                mock_stop.assert_called_once()


class TestSyncClass:
    """_sync_class propagates instance attrs to class level."""

    def test_sync_class_propagates_all_attrs(self, zeroconf_server_instance):
        zeroconf_server_instance.service_type = '_test._tcp.'
        zeroconf_server_instance.server_name = 'foo'
        zeroconf_server_instance.server_port = 9999
        zeroconf_server_instance.server_ip = '10.0.0.1'
        zeroconf_server_instance.properties = {'key': 'val'}

        ZeroconfServer._sync_class()

        assert ZeroconfServer.service_type == '_test._tcp.'
        assert ZeroconfServer.server_name == 'foo'
        assert ZeroconfServer.server_port == 9999
        assert ZeroconfServer.server_ip == '10.0.0.1'
        assert ZeroconfServer.properties == {'key': 'val'}


class TestStartStop:
    """Service lifecycle."""

    def test_start_raises_without_configure(self, zeroconf_server_instance):
        with pytest.raises(RuntimeError, match='configure'):
            ZeroconfServer.start()

    @patch('src.utilities.zeroconf_server.ServiceBrowser')
    def test_start_listen_only_skips_register(self, mock_browser, zeroconf_server_instance):
        with patch('socket.gethostbyname', return_value='192.168.1.1'):
            ZeroconfServer.configure('_zordon._tcp.local.', 'test', 8080)

        with patch.object(zeroconf_server_instance, '_register_service') as mock_register:
            ZeroconfServer.start(listen_only=True)
            mock_register.assert_not_called()

    @patch('src.utilities.zeroconf_server.ServiceBrowser')
    def test_start_registers_service(self, mock_browser, zeroconf_server_instance):
        with patch('socket.gethostbyname', return_value='192.168.1.1'):
            ZeroconfServer.configure('_zordon._tcp.local.', 'test', 8080)

        with patch.object(zeroconf_server_instance, '_register_service') as mock_register:
            ZeroconfServer.start(listen_only=False)
            mock_register.assert_called_once()

    def test_stop_unregisters_and_closes(self, zeroconf_server_instance):
        zeroconf_server_instance.service_info = MagicMock()

        with patch.object(zeroconf_server_instance, '_unregister_service') as mock_unreg:
            with patch.object(zeroconf_server_instance.zeroconf, 'close') as mock_close:
                ZeroconfServer.stop()
                mock_unreg.assert_called_once()
                mock_close.assert_called_once()


class TestRegisterService:
    """Service registration with Zeroconf."""

    @patch('src.utilities.zeroconf_server.ServiceInfo')
    @patch('socket.gethostbyname')
    def test_registers_service_info(self, mock_gethostbyname, mock_service_info,
                                    zeroconf_server_instance):
        mock_gethostbyname.return_value = '192.168.1.1'
        zeroconf_server_instance.service_type = '_zordon._tcp.local.'
        zeroconf_server_instance.server_name = 'test'
        zeroconf_server_instance.server_port = 8080
        zeroconf_server_instance.properties = {}

        # Replace real Zeroconf with a mock so we don't actually register
        zeroconf_server_instance.zeroconf = MagicMock()

        mock_info = MagicMock()
        mock_service_info.return_value = mock_info

        with patch('socket.inet_aton', return_value=b'\xc0\xa8\x01\x01'):
            zeroconf_server_instance._register_service()

        zeroconf_server_instance.zeroconf.register_service.assert_called_once_with(mock_info)
        assert zeroconf_server_instance.service_info == mock_info


class TestFoundHostnames:
    """Discovery cache."""

    def test_found_hostnames_empty_initially(self, zeroconf_server_instance):
        result = zeroconf_server_instance._found_hostnames()
        assert result == []

    @patch('socket.gethostname', return_value='my-machine')
    def test_hostnames_sorted_with_local_first(self, mock_hostname, zeroconf_server_instance):
        zeroconf_server_instance.client_cache = {
            'other-machine': MagicMock(),
            'my-machine': MagicMock(),
        }

        result = zeroconf_server_instance._found_hostnames()
        # sort_key returns False (0) for local → sorted first
        assert result[0] == 'my-machine'

    def test_get_hostname_properties_returns_decoded(self, zeroconf_server_instance):
        info = MagicMock()
        info.properties = {b'key': b'value', b'num': b'42'}
        zeroconf_server_instance.client_cache['server-1'] = info

        result = zeroconf_server_instance._get_hostname_properties('server-1')
        assert result == {'key': 'value', 'num': '42'}

    def test_get_hostname_properties_returns_empty_for_unknown(self, zeroconf_server_instance):
        result = zeroconf_server_instance._get_hostname_properties('unknown')
        assert result == {}


class TestForwarders:
    """Classmethod forwarders delegate to instance."""

    def test_found_hostnames_forwarder(self, zeroconf_server_instance):
        zeroconf_server_instance.client_cache['svr'] = MagicMock()
        result = ZeroconfServer.found_hostnames()
        assert 'svr' in result

    def test_get_hostname_properties_forwarder(self, zeroconf_server_instance):
        info = MagicMock()
        info.properties = {}
        zeroconf_server_instance.client_cache['svr'] = info

        result = ZeroconfServer.get_hostname_properties('svr')
        assert result == {}